Steve Rasmussen commented about 12 hours ago Those clamps are well designed and well made. A friend of mine used plastic nails to pin the work to the spoil board. I suspect these clamps and plastic nails would cover nearly every case.
I'm guessing the plastic nails would be less destructive to the MDF spoilboard than screws. Screws always leave a little raised rupture that has to be scraped-off with a chisel to bring the surface flat again.